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Wednesday, October 8, 2008: 9:50 AM
Laughlin II (Flamingo Las Vegas)
Influence of Strength on the Erosion Corrosion Rate of Stainless Steels
J. Haberl, G. Mori, P. Wagner, Christian Doppler Laboratory of Localized Corrosion,
University of Leoben, Franz-Josef-Str. 18, A-8700 Leoben , Austria ,
M. Oberndorfer, W. Havlik, OMV Exploration & Production GmbH, Laboratory, Materials & Corrosion, Gerasdorfer Straße 151, A-1210 Vienna, Austria
Peter Hosemann, Los Alamos National Laboratory, P.O Box 1663
Los Alamos, NM 87545, USA
A combined flow loop - jet impingement pilot plant has been used to determine mass loss rates in a mixed gas - saltwater - sand multiphase flow at impact velocities up to 60 m/s. Artificial brine with a salt content of 27 g/l was used as liquid phase. Sand content with grain size below 150 µm was up to five times higher than field conditions to accelerate testing. CO2 at a pressure of 15 bar was used as gas phase.
Rectangular stainless steel samples with a size of 30 x 15 x 5 mm were used. They were cut out from solution annealed and cold worked bars, mechanically ground and polished prior to testing. Damaged surfaces of specimens exposed to the high velocity multiphase flow were investigated by stereo microscopy, scanning electron microscopy (SEM) and an optical device for 3D surface measurements. Furthermore, polarization curves were conducted to characterize the electrochemical behavior of the investigated materials. Influence of impact velocity and strength on mass loss rates (erosion corrosion rates) of two austenitic stainless steel grades are presented. Effects of chemical composition and mechanical properties are critically discussed.
J. Haberl, G. Mori, P. Wagner, Christian Doppler Laboratory of Localized Corrosion,
M. Oberndorfer, W. Havlik, OMV Exploration & Production GmbH, Laboratory, Materials & Corrosion, Gerasdorfer Straße 151, A-1210 Vienna, Austria
Peter Hosemann, Los Alamos National Laboratory, P.O Box 1663
A combined flow loop - jet impingement pilot plant has been used to determine mass loss rates in a mixed gas - saltwater - sand multiphase flow at impact velocities up to 60 m/s. Artificial brine with a salt content of 27 g/l was used as liquid phase. Sand content with grain size below 150 µm was up to five times higher than field conditions to accelerate testing. CO2 at a pressure of 15 bar was used as gas phase.
Rectangular stainless steel samples with a size of 30 x 15 x 5 mm were used. They were cut out from solution annealed and cold worked bars, mechanically ground and polished prior to testing. Damaged surfaces of specimens exposed to the high velocity multiphase flow were investigated by stereo microscopy, scanning electron microscopy (SEM) and an optical device for 3D surface measurements. Furthermore, polarization curves were conducted to characterize the electrochemical behavior of the investigated materials. Influence of impact velocity and strength on mass loss rates (erosion corrosion rates) of two austenitic stainless steel grades are presented. Effects of chemical composition and mechanical properties are critically discussed.
Keywords: erosion corrosion, multiphase flow, stainless steel, strength